Where would you expect to find the world’s largest illuminated advertisement? With my years of experience in completely-useless “World’s largest” facts, I would definitely assume it would be in America, perhaps in Times Square or maybe Las Vegas. But I would, of course, be wrong. The largest illuminated advertisement in the world is found in the German city of Leverkusen, and is known as the Bayer Cross. The 51 m diameter logo advertises the German chemical company Bayer AG, which has also given the world aspirin, heroin and methadone. Hanging between two 118 m steel towers, the 300…